He still should be able to dodge that.
The problem with Kryptonite is that writers and filmmakers are wild inconsistent when it comes to how it affects Superman. sometimes it just makes him weak, other times it nearly kills him. Sometimes he's shown as being helpless when around it other times he can muster up the strength to get it away from him or do amazing things while affected by it.
yeah it can be EXTREMELY plot device-ish.
Early in the Batman/Superman comic, Supes shot what looked like Kingdom Come Superman in the chest with a shard of kryptonite from a shotgun. No, I don't have any idea how that's possible. Yes, I'm aware that it's a comic book. But it killed KC Supes, apparently.
I swear I can remember a black dude named Bloodsport shooting superman with a gun that fired KRYPTONITE NEEDLES and Superman lived through it. I think this was like early in the Man of Steel reboot after the OG Crisis. edit:
http://www.comicvine.com/bloodsport/4005-26702/ I can't find a pic of th shooting (remember it from reading old DC Who's Who comic), but I remember it was a big ass Cable style gun.
Meanwhile, Crime Syndicate Atom just took a piece of kryptnoite, shrank down and put it DIRECTLY ON SUPERMAN'S BRAIN and not only did it not kill him, but he did NOT feel/hear her doing it! And it sat there for the WHOLE CROSSOVER. AND HE LIVED.
*note : I know you know this, but I'm assuming there are posters in this thread that don't.
